package com.xy;

/**
 * @author 谢阳
 * @version 1.8.0_131
 * @date 2022/6/13 11:09
 * @description
 */
public class Screen {
    private static final Screen instance = new Screen();

    private Screen(){}

    public static Screen getInstance() {
        return instance;
    }

    public void up() {
        System.out.println("屏幕上升...");
    }

    public void down() {
        System.out.println("屏幕下降...");
    }
}
